EHS FLOWS ON OKLAHOMA ROADWAYS
The main objective of the flow analysis is to provide estimates of annual EHS transportation on Oklahoma highways to better understand the risks associated with EHS transportation within the state.
The EHS shipment data was collected using a web-based survey. The methodology used to derive EHS flow estimates from this shipment data has five main steps. Click on each step to see more details.
Road Network Representation
A GIS map representation of the U.S. Roadway Network
Locations Information for Shipments
The origin and destination locations of the shipments were converted into latitudes and longitudes
Transportation Routes
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The origin and destination locations of shipments were mapped to nodes in the road network.
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The shortest path between a pair of nodes was determined using standard algorithms such as Dijkstra’s.
EHS Flows on Roadways
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Each shipment was assigned to a transportation route corresponding to the shortest path between the origin and destination nodes.
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The shipment information was associated with each road link identified as a component of the path.
Analysis and Visualization
•Aggregation models were developed to combine different flows for a particular EHS material into a single aggregate flow on a highway segment.
•An ArcGIS® application was developed to view annual flow volumes for different EHS.
Example screenshots from the OK-EFRA ArcGIS® application for EHS flow visualization are presented below
Highway segments information
Ammonia Flow on Oklahoma Roadways
